Actually a large part of the equestrian market could still use a form of this. I am in Florida where places like Ocala and Central/South Florida as a whole hav

Actually a large part of the equestrian market could still use a form of this. I am in Florida where places like Ocala and Central/South Florida as a whole have a large number of equestrian activities. I could see a product that was GPS enabled and sent a signal every few minutes via a cell network when in range -- for large open pasture a cell repeater could help increase coverage. And when out of cell range it sends a lower frequency signal broadcasting the coordinates, e.g. 400Mhz or lower. This would let you have a tracking device to find lost animals much faster. And if they get to a place where GPS is no longer connecting, that's fine, the last known position plus signal strength could still get you to the animal much faster. The hard part is making it affordable, in a small enough form factor of low weight but with reasonable battery life to matter. And then how to attach it to the animal, using the halter is one idea, but most people don't like leaving a halter on a horse in a pasture for safety reasons. So then how to mount it without interfering with the animals movement or having it get ripped off when the roll or scratch on a tree etc. When you are riding there are ways to do it via the saddle, reins etc, but when they are out grazing it is a tougher problem. I guess another point though, some riders where safety vests, many wear helmets, so a device for a rider could also be created along the same lines. This would be nice for those trail rides when the horse gets spooked, drops its rider and the rider isn't well enough to walk out. Happens more then people realize.